/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.fragments;

import android.app.Activity;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class HeadlinesFragment extends ListFragment {
   OnHeadlineSelectedListener onHeadlineSelectedListener;

   // The container Activity must implement this interface so the frag can
   // deliver messages
   public interface OnHeadlineSelectedListener {
      /** Called by HeadlinesFragment when a list item is selected */
      public void onArticleSelected(int position);
   }

   @Override public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      // We need to use a different list item layout for devices older than
      // Honeycomb
      int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
            android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;

      // Create an array adapter for the list view, using the Ipsum headlines
      // array
      setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
   }

   @Override public void onStart() {
      super.onStart();

      // When in two-pane layout, set the listview to highlight the selected
      // list item
      // (We do this during onStart because at the point the listview is
      // available.)
      if (getFragmentManager().findFragmentById(R.id.article_fragment) != null) {
         getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
      }
   }

   @Override public void onListItemClick(ListView l, View v, int position, long id) {
      // Notify the listener of selected item
      onHeadlineSelectedListener.onArticleSelected(position);

      // Set the item as checked to be highlighted when in two-pane layout
      getListView().setItemChecked(position, true);
   }

   @Override public void onAttach(Activity activity) {
      super.onAttach(activity);

      // This makes sure that the container activity has implemented
      // the callback interface. If not, it throws an exception.
      try {
         onHeadlineSelectedListener = (OnHeadlineSelectedListener) activity;
      } catch (ClassCastException e) {
         throw new ClassCastException(activity.toString()
               + " must implement OnHeadlineSelectedListener");
      }
   }

}